A zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence, its preparation method and application

Abstract

This invention discloses a zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence, its preparation method, and its applications, belonging to the fields of photoluminescence and halide perovskite materials. The chemical formula of the zero-dimensional indium-based perovskite material of this invention is Cs₂In. 1‑x‑y‑z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ This material exhibits both upconversion and downconversion luminescence properties; it also displays antithermal quenching behavior during the temperature-varying upconversion luminescence process. The preparation method provided by this invention is a high-temperature solution boiling method, introducing Sb, Yb, and Er ions into a zero-dimensional indium-based perovskite, thus achieving the upconversion and downconversion luminescence properties of this type of material. Simultaneously, the prepared zero-dimensional indium-based perovskite material exhibits antithermal quenching behavior. The entire process does not involve the use of hydrochloric acid or other toxic solvents, using only non-toxic and inexpensive distilled water as the solvent, demonstrating the characteristics of a green and environmentally friendly chemical process. This invention's zero-dimensional indium-based perovskite material with upconversion and downconversion luminescence has enormous application potential in the field of non-contact temperature measurement.

Description

Technical Field

[0001] This invention belongs to the technical field of photoluminescence and halide perovskite materials, specifically relating to a zero-dimensional indium-based perovskite material with upconversion and downconversion luminescence, its preparation method, and its application. Background Technology

[0002] In recent years, halogen zero-dimensional (0D) indium-based perovskites have gradually become a hot research area due to their unique physical and optical properties. These materials, with their soft lattice structure and strong interactions between excited-state electrons and the lattice, have achieved highly efficient broadband self-trapped exciton (STE)-related downconversion luminescence. However, currently reported halogen 0D indium-based perovskites can only achieve downconversion luminescence through doping with elements such as antimony (Sb) and tellurium (Te). Theoretically, doping with rare-earth ions such as Yb / Er holds promise for achieving upconversion luminescence, but there have been no successful cases to date. Halogen 0D indium-based perovskites still face multiple challenges in practical applications and research.

[0003] First, from a process perspective, 0D halide indium-based perovskites typically rely on hydrochloric acid to provide the necessary chloride ions. This process is not only environmentally harmful, but also poses safety risks to operators during large-scale industrial production due to the high volatility and corrosiveness of hydrochloric acid. Second, several research teams have attempted to incorporate rare earth ions such as Yb / Er into 0D indium-based perovskites using traditional solution methods. However, because solution methods cannot simultaneously meet the high activation energy and high critical reaction concentration required by rare earth ions, successful doping of Yb / Er and other rare earth ions has not yet been achieved. Finally, traditional non-contact fluorescence thermometers use the change in fluorescence intensity at different temperatures for temperature sensing and measurement. However, from the perspective of the luminescence mechanism, as the temperature increases, the fluorescence intensity of the luminescent material gradually weakens until fluorescence quenching occurs. This problem greatly limits their applicability and efficiency in high-temperature environments.

[0004] In summary, 0D halide indium-based perovskite materials have shown great potential and broad application prospects in the field of luminescent materials; however, it is necessary to solve the problems existing in the current technology and open up new technical routes for the application of 0D halide perovskites in non-contact fluorescent thermometers and temperature measurement technology. Summary of the Invention

[0005] The purpose of this invention is to provide a zero-dimensional indium-based perovskite material with upconversion and downconversion luminescence, its preparation method, and its application, so as to solve the problem that existing luminescent materials cannot achieve upconversion luminescence. This invention realizes upconversion and downconversion luminescence of the luminescent material, and the provided material exhibits fluorescence thermal quenching behavior during the upconversion temperature variation process.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence, wherein the chemical formula of the zero-dimensional indium-based perovskite material is Cs₂In. 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ , where 0.001≤x≤0.1, 0≤y≤0.3, 0≤z≤0.3, and y+z=0.3.

[0008] The zero-dimensional indium-based perovskite material has up-conversion and down-conversion luminescence properties. Under ultraviolet light excitation, the zero-dimensional indium-based perovskite material emits yellow fluorescence; under near-infrared light excitation, the zero-dimensional indium-based perovskite material emits green fluorescence.

[0009] The zero-dimensional indium-based perovskite material exhibits antithermal quenching behavior during upconversion luminescence in the temperature range of 303-543 K.

[0010] Under ultraviolet light excitation, the zero-dimensional indium-based perovskite material emits light at wavelengths between 400 and 1050 nm.

[0011] Under near-infrared light excitation, the emission wavelengths of the zero-dimensional indium-based perovskite material are between 509~540 nm, 540~565 nm, 637~700 nm and 770~830 nm, respectively.

[0012] The present invention also provides a method for preparing the above-mentioned zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence, comprising:

[0013] A solution was obtained by dispersing cesium-containing compounds, indium-containing compounds, antimony-containing compounds, ytterbium-containing compounds, and erbium-containing compounds evenly in distilled water.

[0014] The resulting solution was heated and evaporated to crystallize, thus obtaining the zero-dimensional indium-based perovskite material.

[0015] The molar ratio of the cesium-containing compound, indium-containing compound, antimony-containing compound, ytterbium-containing compound, and erbium-containing compound is 2:0.695:0.005:(0.15~0.277):(0.15~0.023).

[0016] The cesium-containing compound is cesium chloride, the indium-containing compound is indium chloride, the antimony-containing compound is antimony chloride, the ytterbium-containing compound is ytterbium chloride, and the erbium-containing compound is erbium chloride.

[0017] The heating conditions are heating at a temperature of 373~573 K for 5~20 min.

[0018] This invention also provides the application of the above-mentioned zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence in the field of non-contact temperature sensing.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The zero-dimensional indium-based perovskite material provided by this invention has an InCl5(H2O) octahedron in its crystal structure composed of In-Cl and In-O bonds, breaking the symmetry of the zero-dimensional indium-based perovskite Cs2InCl5(H2O) and thus inducing a large Stokes shift. Undoped Cs2InCl5(H2O) has relatively low luminescence efficiency, while co-doping with Sb, Yb, and Er elements improves the luminescence efficiency of Cs2In... 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ Materials in the luminescence mechanism of STEs and Yb 3+ -Er 3+ Under the influence of two types of ion energy level transitions, this material exhibits excellent downconversion and upconversion luminescence properties, respectively. During the temperature-dependent upconversion luminescence process, the fluorescence intensity increases with increasing temperature, exhibiting fluorescence thermal quenching behavior. This provides a practical solution for improving non-contact fluorescence temperature measurement technology, possessing broad commercial prospects and significant scientific research value.

[0021] The high-temperature solution boiling method provided by this invention satisfies the need for higher activation energies and higher critical reaction concentrations for rare earth ions. It successfully introduces Sb, Yb, and Er ions into zero-dimensional indium-based perovskites, achieving both up-conversion and down-conversion luminescence properties in this type of material. Furthermore, the prepared zero-dimensional indium-based perovskite material exhibits antithermal quenching behavior. The entire process does not involve the use of hydrochloric acid or other toxic solvents; only non-toxic and inexpensive distilled water is used, demonstrating the characteristics of a green chemical process.

[0022] The zero-dimensional indium-based perovskite material provided by this invention has extremely high sensitivity and accuracy; it has great application potential in the field of non-contact temperature measurement. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below:

[0024] Figure 1 The XRD pattern of Cs2InCl5(H2O) prepared in Example 1 of this invention;

[0025] Figure 2 Cs2In of Embodiments 3-7 of the present invention 1-x-y-z Cl5(H2O): xSb3+ yYb 3+ zEr 3+ XRD patterns of Yb 3+ / Er 3+ The different doping ratios are 1∶1, 3∶1, 6∶1, 9∶1 and 12∶1;

[0026] Figure 3 Cs2In of Embodiments 3-7 of the present invention 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ The downconversion emission spectrum of Yb 3+ / Er 3+ The different doping ratios are 1∶1, 3∶1, 6∶1, 9∶1 and 12∶1;

[0027] Figure 4 Cs2In of Embodiments 3-7 of the present invention 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ The upconversion emission spectrum of Yb 3+ / Er 3+ The different doping ratios are 1:1, 3:1, 6:1, 9:1 and 12:1;

[0028] Figure 5 Cs2In of Example 5 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ The downconversion temperature spectrum, in which Yb 3+ / Er 3+ The ratio is 6:1;

[0029] Figure 6 Cs2In of Example 4 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ The upconversion temperature spectrum, in which Yb 3+ / Er 3+ The ratio is 3:1. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings:

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] This invention discloses a zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence, through Sb 3+ Yb 3+ and Er 3+ Zero-dimensional indium-based perovskite material Cs2In was obtained by ion co-doping of Cs2InCl5(H2O). 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ Cs + In 3+ The molar ratio is 2:0.695, 0.001≤x≤0.1, 0≤y≤0.3, 0≤z≤0.3, and y+z=0.3.

[0033] The zero-dimensional indium-based perovskite material possesses dual-mode luminescence properties, enabling both up-conversion and down-conversion luminescence. During the down-conversion temperature variation process, the fluorescence intensity first decreases and then stabilizes as the temperature rises, and the luminescence color changes from yellow to red. In contrast, during the up-conversion process, the green fluorescence intensity increases with increasing temperature, exhibiting the unique property of fluorescent thermal quenching.

[0034] This invention provides a method for preparing a zero-dimensional indium-based perovskite material that achieves up-conversion and down-conversion luminescence, comprising:

[0035] S1: Add cesium-containing compounds, indium-containing compounds, antimony-containing compounds, ytterbium-containing compounds and erbium-containing compounds to a reaction vessel, then add distilled water to the reaction vessel and stir to form a clear and transparent solution;

[0036] S2: The resulting solution is heated at 373~573 K for 5~20 min, and evaporated to crystallize, thus obtaining the zero-dimensional indium-based perovskite material Cs2In. 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ .

[0037] In some embodiments, the cesium-containing compound is cesium chloride (CsCl), the indium-containing compound is indium chloride (InCl3), the antimony-containing compound is antimony chloride (SbCl3), the ytterbium-containing compound is ytterbium chloride (YbCl3), and the erbium-containing compound is erbium chloride (ErCl3). It should be noted that using the corresponding chlorides is more in line with the green synthesis process route, avoiding the use of hydrochloric acid during the synthesis process.

[0038] In some embodiments, the molar ratio of the cesium-containing compound, indium-containing compound, antimony-containing compound, ytterbium-containing compound, and erbium-containing compound is 2:0.695:0.005:(0.15~0.277):(0.15~0.023). In step S1, CsCl, InCl3, SbCl3, YbCl3, and ErCl3 are selected and mixed to obtain the zero-dimensional indium-based perovskite material Cs2In. 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ , where Cs + In 3+ =2: 0.695, 0.001≤x≤0.1, 0≤y≤0.3, 0≤z≤0.3, y+z=0.3.

[0039] The zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence prepared by this invention has applications in the field of non-contact temperature sensing.

[0040] This invention proposes a high-temperature solution boiling method for preparation, which simultaneously satisfies the requirements of higher activation energies and higher critical reaction concentrations for rare earth ions. Through this novel process, Sb and Yb / Er plasmas are introduced into zero-dimensional indium-based perovskites, achieving both upconversion and downconversion luminescence properties. Furthermore, the prepared zero-dimensional indium-based perovskite material exhibits antithermal quenching behavior during upconversion temperature variations, demonstrating enhanced luminescence with increasing temperature. The luminescence properties of the zero-dimensional indium-based perovskite material Cs₂InCl₅(H₂O) can be modulated, significantly improving the accuracy and reliability of temperature sensing.

[0041] Of particular note is that the entire preparation process eliminates harmful chemicals such as hydrochloric acid that may be used in traditional methods, instead employing pure and economical distilled water as the sole solvent. This green chemistry practice not only reduces potential environmental pollution but also significantly lowers production costs, highlighting the enormous potential of this invention for sustainable development and industrial applications.

[0042] Other zero-dimensional indium-based perovskite materials can also be prepared using the above preparation method.

[0043] In step S1, CsCl and InCl3 are selected and mixed to obtain the zero-dimensional indium-based perovskite material Cs2InCl5(H2O), wherein Cs + In 3+ =2:1.

[0044] In step S1, CsCl, InCl3, and SbCl3 are selected and mixed to obtain the zero-dimensional indium-based perovskite material Cs2In. 1-x Cl5(H2O): xSb 3+ Among them, Cs + In 3+ =2:0.9~1, 0.001≤x≤0.1. Cs₂In was prepared by doping with a small amount of Sb. 1-x Cl5(H2O): xSb 3+ Material. Cs2In 1-x Cl5(H2O): xSb 3+ The downconversion luminescence of the material originates from the self-trapped exciton transition of the strong electron-phonon coupling, producing a yellow fluorescence with a peak at 610 nm. Its luminescence intensity decays with increasing temperature, exhibiting typical fluorescent thermal quenching characteristics, and has good prospects for optoelectronic applications.

[0045] To better illustrate the purpose, technical solution, and advantages of this invention, the invention will be further described below with reference to specific examples.

[0046] In the following embodiments, unless otherwise specified, all materials used can be obtained through ordinary channels; the testing methods used are conventional methods in the art.

[0047] Example 1

[0048] Weigh 2 mmol of high-purity (99.9%) CsCl and 1 mmol of InCl3, add them to a reaction vessel, then add 4 mL of distilled water and stir for 15 min until all the raw materials dissolve and a clear, transparent solution is formed. Heat the solution at 373 K for 20 min to evaporate and crystallize, obtaining the target product Cs₂InCl₅(H₂O). Figure 1 As shown, XRD indicates that it is a pure phase of Cs2InCl5(H2O).

[0049] Example 2

[0050] Weigh 2 mmol of high-purity (99.9%) CsCl and 0.995 mmol of InCl3 and add them to the reaction vessel. Weigh 1 mmol of SbCl3 and dissolve it in 20 mL of distilled water to prepare a 5% mol / L solution. Add 0.1 mL of the SbCl3 solution dropwise to the reaction vessel, followed by 4 mL of distilled water, and sonicate for 15 min until all the raw materials are dissolved and a clear, transparent solution is formed. Heat the solution at 423 K for 15 min to evaporate and crystallize, obtaining the target product Cs₂In. 0.995 Cl5(H2O): 0.005Sb 3+ .

[0051] Example 3

[0052] Weigh 2 mmol of high-purity (99.9%) CsCl and 0.695 mmol of InCl3 and add them to the reaction vessel. Weigh 1 mmol of SbCl3 and dissolve it in 20 mL of distilled water to prepare a 5% mol / L solution. Weigh 2 mmol of YbCl3 and dissolve it in 10 mL of distilled water to prepare a 20% mol / L solution. Weigh 1 mmol of ErCl3 and dissolve it in 10 mL of distilled water to prepare a 10% mol / L solution. Add 0.1 mL, 0.75 mL, and 1.5 mL of SbCl3, YbCl3, and ErCl3 solutions, respectively, dropwise to the reaction vessel. Then add 2 mL of distilled water and stir for 15 min until all the raw materials dissolve and a clear, transparent solution is formed. Heat the solution at 473 K for 10 min to evaporate and crystallize, obtaining the target product Cs2In. 0.695 Cl5(H2O): 0.005Sb 3+ 0.15Yb 3+ 0.15Er 3+ , where Yb:Er=1∶1.

[0053] Example 4

[0054] Weigh 2 mmol of high-purity (99.9%) CsCl and 0.695 mmol of InCl3 and add them to the reaction vessel. Weigh 1 mmol of SbCl3 and dissolve it in 20 mL of distilled water to prepare a 5% mol / L solution. Weigh 2 mmol of YbCl3 and dissolve it in 10 mL of distilled water to prepare a 20% mol / L solution. Weigh 1 mmol of ErCl3 and dissolve it in 10 mL of distilled water to prepare a 10% mol / L solution. Pipette 0.1 mL, 1.125 mL, and 0.75 mL of SbCl3, YbCl3, and ErCl3 solutions, respectively, into the reaction vessel. Then add 2 mL of distilled water and stir for 15 min until all the raw materials are dissolved and a clear and transparent solution is formed. Heat the solution at 573 K for 5 min to evaporate and crystallize, obtaining the target product Cs2In. 0.695 Cl5(H2O): 0.005Sb 3+ 0.225Yb 3+ 0.075Er 3+ , where Yb:Er=3∶1.

[0055] Figure 4 This indicates that the Cs2In prepared in Example 4 0.695 Sb 0.005 Cl5(H2O): Yb / Er perovskite exhibits the highest upconversion luminescence intensity. According to... Figure 6 It can be seen that in the temperature range of 303 K-543 K, the fluorescence intensity increases with increasing temperature, exhibiting antithermal quenching behavior.

[0056] Example 5

[0057] Weigh 2 mmol of high-purity (99.9%) CsCl and 0.695 mmol of InCl3 and add them to the reaction vessel. Weigh 1 mmol of SbCl3 and dissolve it in 20 mL of distilled water to prepare a 5% mol / L solution. Weigh 2 mmol of YbCl3 and dissolve it in 10 mL of distilled water to prepare a 20% mol / L solution. Weigh 1 mmol of ErCl3 and dissolve it in 10 mL of distilled water to prepare a 10% mol / L solution. Pipette 0.1 mL, 1.284 mL, and 0.428 mL of SbCl3, YbCl3, and ErCl3 solutions, respectively, into the reaction vessel. Then add 2 mL of distilled water and stir for 15 min until all the raw materials are dissolved and a clear and transparent solution is formed. Heat the solution at 523 K for 8 min to evaporate and crystallize, obtaining the target product Cs2In. 0.695 Cl5(H2O): 0.005Sb 3+ 0.2568Yb 3+ 0.0428Er3+ , where Yb:Er=6∶1.

[0058] Figure 3 This indicates that the product prepared in Example 5 has the highest downconversion luminescence intensity. According to... Figure 5 It can be seen that in the temperature range of 303 K-543 K, the fluorescence intensity first decreases with increasing temperature, and then remains unchanged after the temperature reaches 533 K.

[0059] Example 6

[0060] Weigh 2 mmol of high-purity (99.9%) CsCl and 0.695 mmol of InCl3 and add them to the reaction vessel. Weigh 1 mmol of SbCl3 and dissolve it in 20 mL of distilled water to prepare a 5% mol / L solution. Weigh 2 mmol of YbCl3 and dissolve it in 10 mL of distilled water to prepare a 20% mol / L solution. Weigh 1 mmol of ErCl3 and dissolve it in 10 mL of distilled water to prepare a 10% mol / L solution. Pipette 0.1 mL, 1.35 mL, and 0.3 mL of SbCl3, YbCl3, and ErCl3 solutions, respectively, into the reaction vessel. Then add 2 mL of distilled water and stir for 15 min until all the raw materials are dissolved and a clear and transparent solution is formed. Heat the solution at 453 K for 20 min to evaporate and crystallize, obtaining the target product Cs2In. 0.695 Cl5(H2O): 0.005Sb 3+ 0.27Yb 3+ 0.03Er 3+ , where Yb:Er=9∶1.

[0061] Example 7

[0062] Weigh 2 mmol of high-purity (99.9%) CsCl and 0.695 mmol of InCl3 and add them to the reaction vessel. Weigh 1 mmol of SbCl3 and dissolve it in 20 mL of distilled water to prepare a 5% mol / L solution. Weigh 2 mmol of YbCl3 and dissolve it in 10 mL of distilled water to prepare a 20% mol / L solution. Weigh 1 mmol of ErCl3 and dissolve it in 10 mL of distilled water to prepare a 10% mol / L solution. Pipette 0.1 mL, 1.385 mL, and 0.231 mL of SbCl3, YbCl3, and ErCl3 solutions, respectively, into the reaction vessel. Then add 2 mL of distilled water and stir for 15 min until all the raw materials are dissolved and a clear and transparent solution is formed. Heat the solution at 533 K for 7 min to evaporate and crystallize, obtaining the target product Cs2In. 0.695 Cl5(H2O): 0.005Sb 3+0.277Yb 3+ 0.023Er 3+ , where Yb:Er=12∶1.

[0063] Figure 2 Cs2In was prepared in Examples 3-7 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ The XRD patterns of the Yb / Er doping ratios were 1:1, 3:1, 6:1, 9:1 and 12:1.

[0064] The aforementioned via Sb 3+ Doping Cs₂InCl₅(H₂O) yields 0D indium-based perovskite material Cs₂In 1-x Cl5(H2O): xSb 3 + This enables downconversion luminescence.

[0065] During the experiment, it was found that doping with a small amount of Sb 3+ The luminescence intensity of the originally weakly luminescent Cs₂InCl₅(H₂O) indium-based perovskite material was greatly enhanced by the addition of ions. Under ultraviolet light excitation at a wavelength of 365 nm, the luminescence intensity of Cs₂InCl₅(H₂O) indium-based perovskite material was significantly enhanced. 1-x Cl5(H2O): xSb 3+ The emission wavelength range is 400–1050 nm, and the sample emits yellow fluorescence. During temperature variation, the fluorescence intensity decreases with increasing temperature, exhibiting fluorescence thermal quenching behavior.

[0066] The aforementioned via Sb 3+ Yb 3+ and Er 3+ 0D indium-based perovskite material Cs2In was obtained by ion co-doping of Cs2InCl5(H2O). 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ It achieves upconversion and downconversion luminescence, and exhibits fluorescence thermal quenching behavior during the upconversion temperature change process.

[0067] During the experiment, it was found that doping with a small amount of Sb 3+ Yb 3+ and Er 3+ Ions, 0D indium-based perovskite materials Cs2In 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ This 0D indium-based perovskite material, Cs2In, achieves up-conversion and down-conversion luminescence.1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ The sample responds to all excitation sources of ultraviolet light (≤400 nm), with varying luminescence intensities. The emission wavelength range is 400–1050 nm, and the sample emits yellow fluorescence. Under excitation by a 365 nm ultraviolet lamp, an emission peak at 606 nm was observed, demonstrating excellent luminescence performance. In temperature sensing, the fluorescence intensity decreases with increasing temperature until it remains constant. Under near-infrared excitation (e.g., 980 nm), this 0D indium-based perovskite material Cs₂In… 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ The emission wavelengths are between 509–540 nm, 540–565 nm, 637–700 nm, and 770–830 nm, respectively, with emission center wavelengths of 523 nm, 550 nm, 658 nm, and 801 nm, respectively. The samples emit green fluorescence. In temperature sensing, the fluorescence intensity increases with increasing temperature, exhibiting fluorescence thermal quenching behavior.

[0068] The endpoints and any values ​​of the ranges disclosed in this invention are not limited to the precise ranges or values; these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein. In the following, various technical solutions can, in principle, be combined with each other to obtain new technical solutions, which should also be considered as specifically disclosed herein.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still make modifications or equivalent substitutions to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the protection scope of the claims of the present invention pending approval.

Claims

1. A zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence, characterized in that, The chemical formula of the zero-dimensional indium-based perovskite material is Cs₂In. 1-x-y-z Cl5(H2O): xSb 3+ yYb 3+ zEr 3+ Where 0.001≤x≤0.1, 0<y≤0.3, 0<z≤0.3, and y+z=0.

3.

2. The zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence according to claim 1, characterized in that, The zero-dimensional indium-based perovskite material has up-conversion and down-conversion luminescence properties. Under ultraviolet light excitation, the zero-dimensional indium-based perovskite material emits yellow fluorescence; under near-infrared light excitation, the zero-dimensional indium-based perovskite material emits green fluorescence.

3. The zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence according to claim 1, characterized in that, The zero-dimensional indium-based perovskite material exhibits antithermal quenching behavior during upconversion luminescence in the temperature range of 303-543 K.

4. The zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence according to claim 1, characterized in that, Under ultraviolet light excitation, the zero-dimensional indium-based perovskite material emits light at wavelengths between 400 and 1050 nm.

5. The zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence according to claim 1, characterized in that, Under near-infrared light excitation, the emission wavelengths of the zero-dimensional indium-based perovskite material are between 509~540 nm, 540~565 nm, 637~700 nm and 770~830 nm, respectively.

6. A method for preparing a zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence according to claim 1, characterized in that, include: A solution was obtained by dispersing cesium-containing compounds, indium-containing compounds, antimony-containing compounds, ytterbium-containing compounds, and erbium-containing compounds evenly in distilled water. The resulting solution was heated and evaporated to crystallize, thus obtaining the zero-dimensional indium-based perovskite material.

7. A method for preparing a zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence according to claim 6, characterized in that, The molar ratio of the cesium-containing compound, indium-containing compound, antimony-containing compound, ytterbium-containing compound, and erbium-containing compound is 2:0.695:0.005:(0.15~0.277):(0.15~0.023).

8. A method for preparing a zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence according to claim 6, characterized in that, The cesium-containing compound is cesium chloride, the indium-containing compound is indium chloride, the antimony-containing compound is antimony chloride, the ytterbium-containing compound is ytterbium chloride, and the erbium-containing compound is erbium chloride.

9. A method for preparing a zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence according to claim 6, characterized in that, The heating conditions are heating at a temperature of 373~573 K for 5~20 min.

10. The application of the zero-dimensional indium-based perovskite material with up-conversion and down-conversion luminescence as described in any one of claims 1-5 in the field of non-contact temperature sensing.

Images